How to stay on the Atkins Diet?

I once was on the atkins diet for a year and lost 112 lbs. I have been off of it now for 1 year and gained back 45 lbs. I recently tried to get back on the diet but cant seem to manage to keep the will power to stay with it. Does any one have any tips on how to stay with it or to keep my will power up. I heard the diet wasnt healthy but i never had any health problems with it just cant seem to get back on it and stay.